"Game of Thrones" co-stars Sophie Turner and Maisie Williams have the best off-screen friendship (complete with its own hashtag, #Mophie). At the season seven red carpet premiere, INSIDER spoke with Turner about what it's like working with her best friend on "Game of Thrones."

"Well I haven't worked with her since season one, but we all shoot in Belfast," Turner said. "So we have sleepovers whenever we're in Belfast at the same time. She's my best friend, she's my soul mate. I love that girl to pieces."

Turner and Williams often document their hangouts together on Instagram or Twitter, always showing love and admiration for one another. The two actresses even got matching "Game of Thrones" tattoos of the date they both found out they had landed roles on the series: August 7, 2009.

Turner said she hasn't worked directly with Williams since season one, which leads us to believe Arya and Sansa won't meet on "Game of Thrones" season seven, but we're holding out hope that Turner was just trying to keep their reunion a secret. Nothing would make us happier than seeing the best friends on screen together once more.